Wolf Tooth Elliptical Direct Mount Chainring - 32t SRAM 3-Bolt DM Drop-Stop ST For SRAM Boost Cranks Requires HG+ Chain Nickel PlatedElliptical shape for improved power transmission Replaces the existing chainring and spider on 3 bolt GXP cranks including Cane Creek eeWings cranks Must use Shimano HG+ 12sp chain. Wolf Tooth engineers developed a completely new tooth profile to provide optimal chain retention and durability when using this new chain technology Made in the USA from 7075 T6 aluminum alloy TECH SPECS ring type HG+ (anti chain drop) mount 3 bolt DM 3mm offset teeth 32t